sudo docker build -t ubuntu:Apache_Server. We'll need to run the following command in our current working base directory to build an image. Now, after we finish creating our Dockerfile for the Apache container, we are ready to create our first Apache Web Server images with docker. Then, the ENTRYPOINT is set to /usr/sbin/apache2ctl so that the Apache Server will execute. The EXPOSE parameter set's the default Apache port 80 so that the website will be available normally. Here we are updating the Ubuntu repository and installing Apache and other dependencies.
In the above Dockerfile, the first parameter FROM tells Docker what the source of our image is, in this example we're using Ubuntu image.Ī RUN parameter executes a series of commands inside the image to install package.
RUN apt-get update -y & apt-get install apache2 apache2-utils -y To do this, we will need to create a file named Dockerfile using any text editor: sudo nano DockerfileĪdd the following content which includes the commands and arguments for the Apache Web Server Container. Here, we will create a Dockerfile to create an image to install the Apache Web Server container. Each and every instruction set in the Dockerfile adds an additional layer to the image and then performs a commit. There are several commands supported like FROM, CMD, ENTRYPOINT, VOLUME, ENV and many more. It supports a set of commands that we need to use in our Dockerfile. Creating a DockerfileĪ Dockerfile is a text file that has a series of instructions to build an image. Ubuntu Server 14.04 with Docker installed on your system.
In this tutorial, I will explain how to create a Dockerfile, install the required Apache packages, add the necessary content and then build image.
It helps us to avoid issuing the command everytime while running container. A Dockerfile is a text document that contains all the commands a user could call on the command line to build an image.Ī Dockerfile consists of various commands and arguments listed successively to automatically perform actions on a base image in order to create a new one.
Docker can build images automatically by reading the instructions from a Dockerfile. View Plansĭocker allows you to build containers using a Dockerfile. This is great if you need a reminder of the exact names of the Docker images you’re working with.Need Hosting? Try ours, it's fast, reliable and feature loaded with support you can depend on. Once a container is stopped, it will not accept any commands associated with running containers.ĭocker -a will show all the currently active containers. The commands docker start and docker stop can be used to pause or un-pause a container.ĭocker stats allows a user to see how much memory the container is using. To run a container in interactive mode, use the following before the image name:Īllows you to see the details of the container which is running including status, original image name, and when it was created.
This allows full manipulation of Docker images without running them, although once the user is satisfied with their amendments the image can be run so that it becomes a container (see below). This command creates a layer over the original image which is writeable and ready to run specific commands. Use the command docker create plus any relevant options. To rename an image for your own use, use the following after your docker pull or docker run command: Some images have tags for different versions which you can add into the command line using a colon directly after the image name. …hopefully followed by a line advising the relevant image is being pulled from the library (Hub).
If you try to run an image which is not available on the local Docker host, the system should try to pull and run it directly from Docker Hub. Users can log into Docker Hub and explore repositories to view available images.Ĭommand line: docker pull or docker run A Docker pull command will summon one (or more) of these images to the Docker host, where the image can be deployed as a container using the Docker run command. Docker Hub is an online registry where the images you have created can be held.